ASUS F2A85-M motherboard archive, a 465 KB RAR with the model as its only stated detail. The board is a micro-ATX design on the AMD A85X chipset for FM2 APUs. Expect boardview layout data, which a boardview program displays with designators, pin nets and probe points useful for power-on and short diagnostics; the size hints that more than one file may be included. Extract and review the contents, then verify the revision printed on the PCB matches.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @boardview. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
7-ZipWinRARThe Unarchiver (macOS)